I've been using Roku since the first generation device and currently have an Ultra 4800X which compared to the others is a rocket ship. To maintain performance I use a power line network/Ethernet connection rather than WiFi though my WiFi 6 router is speedy. That said, reviews of the newest Ultra haven't been great so I'd recommend the 4800X.
Power User (film maker)
Mill Valley, CA
Jonathan
Roku Ultra 4800R; LG OLED55B7A, ONKYO TX-NR636, Panasonic Blu Ray, Definitive Studio Monitor 450 (L/R), Definitive LCR 2000 (center), Definitive 10" sub-woofer, Definitive surrounds. Motorola MB8600 modem. Asus RT-AX86S WiFi 6 router. Western Digital Power Line network adapters